atoms vocab Flashcards
atomic theory
all matter is made up of indivisible particles called atoms
negatively charged particles orbiting the nucleus
electrons
particles with no charge in the nucleus - neutral
neutrons
tells you how many protons are in an atom of the element
atomic number
amount of particles equal to 1 mole
avagadros number
electrons in the outermost level of an atom
valence electrons
Greek philosopher who suggested the universe is made of indivisible units called atoms
democritus
British scientist proposed that most of the mass of the
atom was concentrated in the atom’s center - discovered nucleus;
rutherford
a chemical
compound always contains the same
elements in exactly the same proportions by
weight or mass
law of definite proportions
positively charged dense core located in center of atom
nucleus
a charged particle
ion
area where electrons can be found in the atom
energy level
lowest state of energy of an atom
ground state
revised the Atomic Theory in 1808; based his theory
on experimental evidence; considered to be the foundations for the modern atomic theory.
dalton
danish physicist; suggested that the energy of each electron
was related to the path it follows around the
nucleus.
bohr
